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Level 3 Repair
8-3-3. GSM850 RX
Phone can't catch GSM850 network
PAM100 @ C103 3.0V ?
NORMAL CONDITION
catch the channel?
YES
PAM100 CHECK
@CN100
-65dBm ?
YES
Check the connection
C165, C167, L119
YES
Check the voltage
YES
Replace Board(PBA)
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Put more lead solder
NO
@C104,L105,C170,L120,L101
L102, R100,R101,R102,R103
NO
Put more lead solder CN100,
L120,L101,L102,L131
NO
Put more lead solder
each terminal
NO
Put more lead solder
each terminal
Back to
previous step
8-10
CONTINUOUS RX ON
RF INPUT : 190CH
Amplitude : -50dBm
Does Phone catch
the GSM850 network?
YES
END
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